Question

Hi , I need your help please. I don't know how to do this . I posted this question before and some sweet person did all this work below but I don't really understand ( i also don't know if it's right)and he also did the GRAPH on paper .I Need the GRAPH on EXCEL PLEASE.

If you kindly maybe type it so I can fill this chart that would be really great ( I just gotta show some work to teacher) THANK YOU

Moles Determi- mL Moles nation Nazs203 Nazs203 S2082 remaining remaining time in s time in min consumed consumed remaining Prepare a graph of lnIS20e2-1 vs. time in min, determine the pseudo-first order rate constant k' and calculate the rate constant k.

THIS THE EXPERIMENT WE DID.

This is the results from experiment.

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this was the answer that was posted

Answer 1

You added 3.0 mL of 0.15 M sodium persulphate (Na₂S₂O₈) to each of the test tubes. The total volume of the solution in each test tube is 12.0 mL. Note that you added 3.0 mL persulphate to each of test tubes 1-5.

Therefore,

moles S₂O₈^2- added = (3.0 mL)*(1 L/1000 mL)*(0.15 mol/L ) = 4.5*10^-4 mol.

[S₂O₈^2-]_initial = 0.0375 M

Write down the two equations:

S₂O₈^2- + 2 I^- ------> 2 SO₄^2- + I₂

2 S₂O₃^2- + I₂ ------> S₄O₆^2- + 2 I^-

Moles S₂O₃^2- = ½*(moles I₂ consumed) = ½*(moles I₂ liberated) [ I₂ is generated instantly by the action of persulphate on KI].

Again moles I₂ liberated = moles S₂O₈^2- consumed.

Therefore, moles S₂O₈^2- consumed = 1/2*(moles S₂O₃^2- consumed).

Now, we shall compute moles S₂O₃^2- consumed and hence moles S₂O₈^2- consumed.

Determination	Moles S2O32- consumed = (volume of S2O32- in L)*(concentration of S2O32- in mol/L)	Moles S2O82- consumed = 2*moles S2O32-	Moles S2O82- remaining = (moles S2O82-)initial – (moles S2O82-)consumed
1	6.0*10-4	3.0*10-4	1.5*10-4
2	5.0*10-4	2.5*10-4	2.0*10-4
3	4.0*10-4	2.0*10-4	2.5*10-4
4	3.0*10-4	1.5*10-4	3.0*10-4
5	2.0*10-4	1.0*10-4	3.5*10-4

Total volume of the solution = 12.0 mL.

Determination	[S2O82-] remaining (M) = (moles S2O82- remaining)/total volume in L	ln [S2O82-]remaining	Time in minutes	Time in seconds
1	0.0125	-4.38	6.30	378
2	0.0167	-4.09	5.26	315.6
3	0.0208	-3.87	4.46	267.6
4	0.0250	-3.69	3.32	199.2
5	0.0292	-3.53	2.16	129.6

Now plot ln [S₂O₈^2-]_remaining (y co-ordinates) vs time in minutes (x co-ordinates).